Mystique

Hexproof
{1}{u/b}{u/r}: Mystique becomes a copy of another
target creature until end of turn, its still a 3/3
human mutant creature with hexproof.
Whenever a creature that Mystique is a copy of triggers or activates an ability or gets targeted
by a spell, copy that triggered or activated ability
and/or cast a copy of that spell targeting
Mystique.